Rotating Membrane Cell

Abstract

pattern was presented in each modality) show less than 15 percent reorganization of the pattern when patterns began at nonpreferred start points. Therefore, sequences of either left-right or modality elements were perceived as structured patterns, but sequences in which the left-right elements were 'embedded' in an irrelevant alternation of modalities (every two, four, or eight elements) were organized by modality, not by pattern structure.Differences in the rate of identification of patterns are determined by the modality or pair of modalities used to present the pattern. The rate of identification of patterns presented in pairs of modalities is not necessarily slower than identification of patterns presented in one modality. Only the A-T combination produced poorer performance than its component modalities, and for this combination, performance was poorer whether the elements of the stimulus were organized by modality (method two) or by pattern structure (method three). The physiological similarity of the A and T modalities (7) may cause confusion when the pattern elements-presented in these modalities must be integrated. Alternating between the T and V modalities, and especially between the A and V modalities, seems to produce a sensation of "snapping back and forth" between modalities which is absent when alternating between the A and T modalities.

Measurements of Membrane Permeabilities Using a Rotating Batch Dialyzer

“…The measurement of membrane permeability is complicated by the need to separate the resistance to mass transport into those components characteristic of the membrane and those attributable to the device in which the measurements are performed. Perhaps the simplest apparatus yet devised for such measurements is the rotating dialysis cell described by Regan, et al (1968Regan, et al ( , 1970. Their cell consists of two hollowed-out disks which are clamped together with the membrane to be tested separating the two halves.…”

Starch-based films. Preliminary diffusion evaluation

“…When a strong alkali, such as sodium hydroxide, was used in place of ammonia, we found the films to be much more transparent and quite permeable to small molecules. Permeability characteristics of the films were measured with a rotating dialysis cell prepared as described by Regan et al (1968) and Wendt et al (1971).…”